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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fc39528f71fe63bcba7eb27f656d8fafd844fbe0331ac1cf6068d1ffa9f069c' 
  AND token = 'iwW2lRiFnbaxsR642sFXca0if3XD4VFWNrNI8Q/CKxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}